Alright here's my situation. I'm switching to the Note4 later this week. I've heard the nightmarish stories of friends who wouldn't get messages for weeks from friends because they didn't turn off iMessage before they switched. I've planned ahead. I switched off iMessage yesterday, deregistered my number from iMessage using Apple's new tool and everything works for the most part. If someone deletes our threaded conversation and sends a new message, I get them no problem. The issue seems to lie within a group message. In 3 people groups, I've figured out how to get everyone's messages coming through. However, on a group message with 3 other people, I'm running in to issue. I receive 2 people's messages, but when the third person texts, it resets one of the other person's texts back to iMessage.
Long story short: Has anyone switched from iPhone to Android and gotten a seamless messaging transition?